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@ouflak my understanding is that they clearly mark ads that show up on top as such, and other results should be impartial. I've read that this was a fundamental design decision partly due to the idealism of Sergey and Brin (I lost that precious quote), but also as a way to it give greater credibility. Let me know if you find a source saying otherwise. Ads that cannot be paid to disappear are of course evil, but ads that are not clearly disclosed even more so.
